DE212021000247U1 - RFID auxiliary antenna device - Google Patents

Abstract

An auxiliary RFID antenna device which is an auxiliary antenna device to be provided on an article which is adjacent to an RFID tag to be communicated or houses the RFID tag, the auxiliary RFID antenna device having a conductive structure which Article encloses where
a capacitance component generated between conductive patterns and an inductance component of the conductive pattern form a resonant circuit; and
a resonant frequency of the resonant circuit is equal or substantially equal to a communication frequency of the RFID tag.

Description

technical field

The present disclosure relates to an auxiliary RFID antenna device used to support communication with an RFID tag.

background technique

Patent Literature 1 discloses a small-sized RFID tag including a magnetic field antenna.

An antenna used in an RFID system includes an electric field antenna and a magnetic field antenna. While the electric field antenna enables a communication distance to be increased, the same planar provides an antenna structure with a length of 1/2 wavelength of a communication frequency, for example, in the case of the electric field antenna, such as a dipole antenna. In contrast, the magnetic field antenna can be basically configured simply by forming a coil-type antenna, and thus the same can be reduced in size more easily than the electric field antenna.

reference list

patent literature

Patent Literature 1: International Publication No. 2011/118379

abstract

Technical problem

On the other hand, an RFID tag including a magnetic field antenna has a shorter transmission distance and a smaller communication range than an RFID tag including an electric field antenna, posing problems to be solved.

In view of the above, exemplary embodiments of the present disclosure relate to providing an auxiliary RFID antenna device that increases a substantial communication range between an RFID tag and a reader/writer of the RFID tag.

the solution of the problem

An auxiliary RFID antenna device as an exemplary embodiment of the present disclosure is an auxiliary antenna device to be provided on an article adjacent to an RFID tag to be communicated or receiving the RFID tag, the auxiliary RFID antenna device having a conductive structure enclosing the article, a capacitance component generated between conductive structures and an inductance component of the conductive structure form a resonant circuit, and a resonant frequency of the resonant circuit is equal to or substantially equal to a communication frequency of the RFID tag.

According to the above configuration, the resonance circuit is configured by the capacitance component generated between the conductive structures, and the inductance component of the conductive structure acts as the auxiliary antenna device to be coupled with each of an antenna of the RFID and an antenna of a reader/writer, what improves the communication performance between the RFID tag and the reader/writer.

Advantageous Effects of Disclosure

According to the present disclosure, an RFID system can be configured in which a substantial communication range between an RFID tag and a reader/writer of the RFID tag is increased. Also, the RFID tag can be further reduced in size compared to similar communication areas.

character list

• 1(A) 12 is a perspective view showing a configuration including an auxiliary RFID antenna device 101 according to a first exemplary embodiment, an article 10 including the auxiliary RFID antenna device 101, an RFID tagged article 20, and an antenna substrate 30. FIG. 1(B) FIG. 14 is a perspective view showing a back side of the RFID tagged article 20. FIG.
• 2(A) 12 is a partial plan view of the auxiliary RFID antenna device 101 and 2 B) 12 is a partial cross-sectional view of the auxiliary RFID antenna device 101.
• 3(A) 12 is a horizontal cross-sectional view of the article 10 and the auxiliary RFID antenna device 101 attached to the article 10. FIG. 3(B) is an enlarged cross-sectional view of a portion indicated by a circle B in 3(A) is surrounded.
• 4 12 is an equivalent circuit diagram of the auxiliary RFID antenna device 101.
• 5 12 is a view showing a coupling relationship between RFID tags 21A and 21B, the RFID auxiliary antenna device 101 and a reader/writer 301 shows.
• 6 14 is a perspective view of another auxiliary antenna device according to the first exemplary embodiment.
• 7(A) 12 is a partial plan view of an auxiliary RFID antenna device 102 according to a second example embodiment and FIG 7(B) 12 is a partial cross-sectional view of the auxiliary RFID antenna device 102 in a hatched portion in FIG 7(A) .
• 8(A) 12 is a horizontal cross-sectional view of the article 10 and the auxiliary RFID antenna device 102 attached to the article 10. FIG. 8(B) Fig. 14 is an enlarged cross-sectional view of a portion indicated by a circle B in Fig 8(A) is surrounded.
• 9 10 is an equivalent circuit diagram of the auxiliary RFID antenna device 102.
• 10 14 is a partial plan view of another auxiliary antenna device according to the second exemplary embodiment.
• 11(A) 12 is a partial plan view of an auxiliary RFID antenna device 103 according to a third exemplary embodiment and FIG 11(B) 12 is a cross-sectional view of a hatched portion in FIG 11(A) .
• 12 10 is a perspective view of article 10 including an auxiliary RFID antenna device 104 according to a fourth example embodiment.
• 13 12 is a partial development view of the auxiliary RFID antenna device 104.
• 14 10 is an equivalent circuit diagram of the auxiliary RFID antenna device 104.
• 15 12 is a partial development view of an auxiliary RFID antenna device 105 according to a fifth example embodiment.

Description of exemplary embodiments

First exemplary embodiment

1(A) 12 is a perspective view showing a configuration including an auxiliary RFID antenna device 101 according to a first exemplary embodiment, an article 10 including the auxiliary RFID antenna device 101, an RFID tagged article 20, and an antenna substrate 30. FIG. 1(B) FIG. 14 is a perspective view showing a back side of the RFID tagged article 20. FIG.

like it in 1(B) is shown, an RFID label (or RFID tag) 21 adheres to the RFID-tagged article 20. As shown in FIG 1(A) As shown, the article 10 is a bottomed cylindrical container and is a molded body of an insulating resin. A plurality of RFID tagged items 20 are included in this item 10 . The RFID auxiliary antenna device 101 is provided on the article 10 to enclose an outer side surface of the article 10 . This RFID auxiliary antenna device 101 is not connected to any particular external circuit and is self-contained.

like it in 1(A) 1, a reader/writer antenna 31 is provided on the antenna substrate 30 by a loop antenna. The reader/writer antenna 31 is connected to an unillustrated reader/writer. The reader/writer reads and writes in each RFID tag 21 in a state where the article 10 accommodating the RFID tagged article 20 is placed on the antenna substrate 30 .

The auxiliary RFID antenna device 101 is coupled to an antenna of the RFID tag 21 and the reader/writer antenna 31 . Such a configuration supports communication between the RFID tag 21 and the reader/writer.

2(A) 12 is a partial plan view of the auxiliary RFID antenna device 101 and 2 B) 12 is a partial cross-sectional view of the auxiliary RFID antenna device 101. This auxiliary RFID antenna device 101 comprises a conductive structure 11 made of metal foil adhered to a base insulating material 13. FIG. In the present exemplary embodiment, this conductive pattern 11 is a simple stripe-like pattern having a width narrower than a width of the base material 13. An adhesive layer (a layer of pressure-sensitive adhesive) 14 is provided on a surface of the base material 13 on which the conductive structure 11 is provided. The base material 13 is a resin sheet made of PET (polyethylene terephthalate), PI (polyimide), or the like, and the conductive pattern 11 is obtained by patterning the metal foil such as aluminum foil or CU foil.

3(A) 12 is a horizontal cross-sectional view of the article 10 and the auxiliary RFID antenna device 101 attached to the article 10. FIG. The interior of article 10 is in an empty state. 3(B) Fig. 14 is an enlarged cross-sectional view of a portion indicated by a circle B in Fig 3(A) is surrounded. The RFID auxiliary antenna device 101 is adhered to an outside surface of the article 10 by the adhesive layer 14 enclose. A first end and a second end of the strip-like conductive structure 11 overlap each other. A first capacitance component is generated between the conductive patterns 11 facing each other in a stacking direction through the base material 13 . A length in a direction in which this overlapping portion is circular is a length by which the first capacitance component works as a capacitance of a resonance circuit. The length is, for example, 1/2 or less of the entire circumference of the conductive structure 11.

4 12 is an equivalent circuit diagram of the auxiliary RFID antenna device 101. In 4 a capacitor C1 is equivalent to the first capacitance component generated between the first end and the second end of the conductive pattern 11 . An inductor L is equivalent to an inductance component of the conductive pattern 11. The capacitor C1 and the inductor L form an LC resonance circuit. The capacitance of the capacitor is 2 pF, for example, and the total inductance of the inductor L is 15 nH, for example.

A resonance frequency of the resonance circuit is equal to or substantially equal to a communication frequency of the RFID tag 21 . For example, when the RFID tag is an RFID tag in a 900 MHz band, the resonant circuit resonates in the 900 MHz band. The resonance frequency of the auxiliary RFID antenna device 101 may also be a frequency at which the antenna of the RFID tag 21 and the reader/writer antenna are magnetically coupled to each other. The conductive pattern 11 not only simply uses the inductance but also forms a circular loop shape by enclosing the outer diameter of the article 10.

5 FIG. 12 is a view showing a coupling relation among RFID tags 21A and 21B, the auxiliary RFID antenna device 101, and a reader/writer 301. FIG. The RFID tags 21A and 21B are two of a plurality of RFID tags 21. In this example, a magnetic field antenna of the RFID tag 21A and a loop of the conductive structure 11 are magnetically coupled to each other. In addition, the RFID auxiliary antenna device 101 and the reader/writer antenna 31 of the reader/writer 301 are magnetically coupled to each other. Further, a magnetic field antenna of the RFID tag 21B and the reader/writer antenna 31 are magnetically coupled to each other.

According to the above configuration, the resonance circuit configured by the first capacitance component formed between the conductive patterns 11 and the inductance component of the conductive pattern 11 acts as a resonance circuit to be coupled with the antenna of the RFID tag 21. and as a resonant circuit to be coupled to the reader/writer antenna 31 of the reader/writer 301. As a result, the auxiliary RFID antenna device 101 acts as an auxiliary antenna device that performs a relay function between the RFID tag 21 and the reader/writer 301 . In addition, the auxiliary RFID antenna device 101 can also act as an antenna for a repeater of the RFID tag 21 or the reader/writer 301 .

Note that the auxiliary RFID antenna device 101in 5 , as shown in the coupling between the RFID tag 21B and the reader/writer antenna 31, a direct coupling between the RFID tag 21 and the reader/writer antenna 31 is not blocked.

According to the present exemplary embodiment, an RFID system can be configured in which a substantial communication range between the RFID tag 21 and the reader/writer 301 of the RFID tag 21 is increased. In addition, a predetermined communication area can be secured by the function of the auxiliary RFID antenna device 101 even when the antenna of the RFID tag is reduced in size, so that the RFID tag can be further reduced in size compared to similar communication areas.

Even though 1(A) , 3(A) and other drawings show an example in which the article 10 as a container for accommodating the RFID tag is a bottomed cylindrical container, note that the shape of the article 10 is not limited to such a shape. For example, is 6 12 is a perspective view of article 10 including another RFID auxiliary antenna device 101 according to the present exemplary embodiment. In this example, the auxiliary RFID antenna device 101 is adhered to a side surface of the article 10 having a rectangular parallelepiped shape.

In this way, the shape of the article 10 is not limited to a circular cylindrical shape or a rectangular cylindrical shape, and may be any shape in which the auxiliary RFID antenna device forms a loop antenna.

In addition, the auxiliary RFID antenna device 101 may be provided on not only a container that accommodates the RFID tag to be communicated but also an article adjacent to the RFID tag. For example, the auxiliary RFID antenna device 101 on the side surface of a bottomless article may be provided with a circular cylindrical shape or a rectangular cylindrical shape, and an article having this RFID auxiliary antenna device 101 may be arranged near the RFID tag.

Second exemplary embodiment

In a second example embodiment, an auxiliary RFID antenna device 102 is described in which a conductive pattern is provided on a plurality of layers.

7(A) FIG. 12 is a partial plan view of an auxiliary RFID antenna device 102 according to the second example embodiment, and FIG 7(B) 12 is a partial cross-sectional view of the auxiliary RFID antenna device 102 in a hatched portion in FIG 7(A) . This auxiliary RFID antenna device 102 includes a conductive pattern 11 made of metal foil adhered to a bottom surface of base insulating material 13 and a conductive pattern 12 made of metal foil adhered to a top surface of base material 13 . The conductive pattern 11 is a stripe-like pattern having a width narrower than the width of the base material 13 and includes a discontinuous portion 11D in an intermediate portion of the pattern. The conductive pattern 12 is provided on the base material 13 in a plan view of the conductive pattern 11 to bridge the broken portion 11D of the conductive pattern 11 in an insulating state. Therefore, capacitors C21 and C22 each equivalent to a second capacitance component are formed between a vicinity of an end of the discontinuous portion 11D of the conductive pattern 11 and the conductive pattern 12. FIG. An adhesive layer 14 is provided on a surface of the base material 13 on which the conductive pattern 11 is provided.

8(A) 12 is a horizontal cross-sectional view of the article 10 and the auxiliary RFID antenna device 102 attached to the article 10. FIG. 8(B) Fig. 14 is an enlarged cross-sectional view of a portion indicated by a circle B in Fig 8(A) is surrounded. The auxiliary RFID antenna device 102 is adhered to the outside surface of the article 10 through the adhesive layer 10 to enclose the outside surface of the article 10 . A first end and a second end of the strip-like conductive structure 11 overlap each other. A capacitor C<b>1 equivalent to a first capacitance component is created between conductive patterns 11 facing each other in a stacking direction through the base material 13 .

In addition, the conductive pattern 11 includes a plurality of broken portions 11D, and the conductive pattern 12 for bridging each of these broken portions 11D in the state of isolation is provided. Each of the capacitors C21 and C22 equivalent to the second capacitance component is generated between the conductive pattern 11 and the conductive pattern 12 facing each other in the stacking direction through the base material 13 .

Even though 8(A) Illustrating the auxiliary RFID antenna device 102 comprising a plurality of conductive structures 12, an auxiliary RFID antenna device comprising a single conductive structure 12 can also be configured.

9 FIG. 14 is an equivalent circuit diagram of the auxiliary RFID antenna device 102. As with the example described in the first exemplary embodiment, FIG 9 the capacitor C1 equivalent to the first capacitance component generated between the first end and the second end of the conductive pattern 11 . An inductor L2 is equivalent to an inductance component of each conductive pattern 11 separated by the discontinuous portion 11D. The capacitor C2 is equivalent to the second capacitance component and is a combined capacitance of the capacitors C21 and C22 each equivalent to the second capacitance component generated between the vicinity of the end of the discontinuous portion 11D of the conductive pattern 11 and the conductive pattern 12 . The capacitance of the capacitor C1 is, for example, 2 pF, the capacitance of the capacitor C2 is, for example, 20 pF, and the inductance of the inductor L2 is, for example, 16 nH.

The capacitance of the capacitor C2 is sufficiently smaller than the capacitance of the capacitor C1. The capacitor C1 provided at the end of the winding of the RFID auxiliary antenna device 102 is affected by a winding deviation to the article 10, a thickness of the adhesive layer 14 or the like, so that the capacitance tends to vary and a fluctuation in resonance frequency is affected. On the other hand, a variation factor in the capacitor C2 provided as a sheet includes an electrode width and a base material thickness when the sheet is provided, and the variation in the capacitor C2 can be generally kept smaller than the variation in the capacitor C1. The capacitance component of the resonance circuit is a combined capacitance component of a series connection of the capacitor C1 and the capacitor C2. As described above, when C1>>C2, the effect of the fluctuation in C1 on the capacitance component of the resonance circuit can be reduced.

The inductor L2, the capacitor C2 of the second capacitance component, and the capacitor C1 of the first capacitance component included in 9 are shown form the LC resonant circuit. The resonance frequency of the resonance circuit is equal to the communication frequency of the RFID tag 21 or is substantially equal to the communication frequency. For example, when the RFID tag is an RFID tag in a 900 MHz band, the resonant circuit resonates in the 900 MHz band. As with the auxiliary RFID antenna device 101 described in the first exemplary embodiment, the conductive pattern 11 not only uses the inductance but forms a circular loop shape by enclosing the outer diameter of the article 10.

Also, a combination of an inductor L2 and a capacitor C2 connected across the inductor forms the in 9 are shown, a unit resonant circuit. In short, a plurality of unit resonance circuits connected in series forms a loop. As a result, an accumulation of inductance (simple addition of inductance of a plurality of inductors (inductors L, shown in 4 shown)) are avoided and voltages resonating at both ends of the unit resonant circuit are real numbers, so no phase is accumulated around the loop and currents around the loop are essentially in phase. In other words, the currents remain constant along the loop and a magnetic field aligned along the axis of the loop is created.

According to the above configuration and function, even if the size of the loop is small, the magnetic field can be similar to a simple LC resonance circuit using a loop and a capacitor, as in the case of FIG 4 example shown, are generated.

10 14 is a partial plan view of another auxiliary RFID antenna device according to the second exemplary embodiment. The RFID auxiliary antenna device includes a conductive pattern 11 made of metal foil adhered to a lower surface of the base insulating material 13 and a conductive pattern 12 made of metal foil adhered to an upper surface of the base material 13 . A portion of the conductive pattern 11 facing the conductive pattern 12 is smaller than a width of the conductive pattern 12. Even if positions where the conductive pattern 11 and the conductive pattern 12 are provided are misaligned in a width direction 10, therefore, the total facing area of the vicinity of the end of the discontinuous portion 11D of the conductive pattern 11 and the conductive pattern 12 remains constant. In addition, even if positions where the conductive pattern 11 and the conductive pattern are provided in a longitudinal direction are misaligned, the total facing area of the vicinity of the end of the discontinuous portion 11D of the conductive pattern 11 and the conductive pattern 12 remains constant. Therefore, the second capacitance component is hardly affected by the effect of misalignment of the positions where the conductive pattern 11 and the conductive pattern 12 are provided.

Third exemplary embodiment

In a third exemplary embodiment, an auxiliary RFID antenna device in which the configuration of the second conductive pattern differs from the configuration in the example shown in the second preferred embodiment will be described.

11(A) 12 is a partial plan view of an auxiliary RFID antenna device 103 according to the third exemplary embodiment and FIG 11(B) 12 is a cross-sectional view of a hatched portion in FIG 11(A) . This auxiliary RFID antenna device 103 includes a conductive pattern 11 and a conductive pattern 12 made of metal foil adhered to a lower surface of a base insulating material 13 . The conductive structure 11 includes a discontinuous portion 11D in an intermediate portion of the structure. The conductive pattern 12 faces the end of the conductive pattern 11 separated by the broken portions 11D in a plane direction of the base material 13 . Therefore, capacitors C21 and C22 each equivalent to the second capacitance component are generated between the vicinity of the end of the discontinuous portion 11D of the conductive pattern 11 and the conductive pattern 12. FIG. An adhesive layer 14 is provided on a surface of the base material 13 on which the conductive pattern 11 is provided.

In this way, the conductive structure 11 and the conductive structure 12 can be provided on the same layer. According to the present exemplary embodiment, the conductive pattern 11 and the conductive pattern 12 are provided at the same time, so a change in characteristics due to printing misalignment is significantly reduced.

Fourth exemplary embodiment

In a fourth exemplary embodiment, an auxiliary RFID antenna device described device that does not include a base material on which a conductive structure is provided.

12 14 is a perspective view of article 10 including an auxiliary RFID antenna device 104 according to the fourth exemplary embodiment. 13 12 is a partial development view of the auxiliary RFID antenna device 104.

The article 10 is a container that accommodates an RFID tag, and is, for example, an insulating resin molded body. A plurality of conductive patterns 11 and 12 are provided on the outside surface of article 10 . The conductive structure 11 is a stripe-like structure and includes a discontinuous portion 11D in an intermediate portion of the structure. The conductive pattern 12 is provided along the discontinuous portion 11D of the conductive pattern 11 . Therefore, a capacitance component is generated between a vicinity of an end of the broken portion 11D of the conductive pattern 11 and the conductive pattern 12 .

14 12 is an equivalent circuit diagram of the auxiliary RFID antenna device 104. In 14 is a capacitor C equivalent to the capacitance component generated between the conductive pattern 11 and the conductive pattern 12 . An inductor L is equivalent to an inductance component of each conductive pattern 11 separated by the discontinuous portion 11D.

A plurality of inductors L and a plurality of capacitors C included in 14 are shown form an LC resonant circuit. The resonance frequency of the resonance circuit is equal to the communication frequency of the RFID tag 21 or is substantially equal to the communication frequency. The conductive structure 11 not only uses the inductance but also forms a circular loop shape by enclosing the outer diameter of the article 10.

As shown in the present exemplary embodiment, the conductive structure can be provided directly on the surface of the article.

Fifth exemplary embodiment

In a fifth exemplary embodiment, an auxiliary RFID antenna device is described, which includes a conductive structure provided directly on a surface of an article, a first capacitance component, and a second capacitance component.

15 12 is a partial development view of an auxiliary RFID antenna device 105 according to the fifth example embodiment. This auxiliary RFID antenna device 105 is provided directly on the surface of the article 10 as in FIG 12 shown example. A plurality of conductive patterns 11 and 12 are provided on the outside surface of article 10 . The conductive structure 11 is a stripe-like structure and includes a discontinuous portion 11D in an intermediate portion of the structure. The conductive pattern 12 is provided along the discontinuous portion 11D of the conductive pattern 11 . In short, the conductive pattern 12 faces the discontinuous portion 11D of the conductive pattern 11 along the surface of the article. Therefore, capacitors C21 and C22 each equivalent to a second capacitance component are formed between the vicinity of the end of the discontinuous portion 11D of the conductive pattern 11 and the conductive pattern 12. FIG. In addition, the vicinity of a first end and the vicinity of a second end in a circular direction in which the plurality of conductive patterns 11 are circular are parallel in the circular direction. A capacitor C1 equivalent to a first capacitance component is created in this section.

The equivalent circuit of the auxiliary RFID antenna device 105 according to the fifth example embodiment is as shown in FIG 9 shown in the second exemplary embodiment.

As shown in the present exemplary embodiment, a conductive structure can be provided directly on the surface of the article to provide the first capacitance component and the second capacitance component.

Finally, the present disclosure is not limited to the above exemplary embodiments. Various modifications or changes can be appropriately made by those skilled in the art. The scope of the present disclosure is not defined by the foregoing exemplary embodiments, but is defined by the following claims. Furthermore, the scope of the present disclosure shall include all possible modifications or changes of the exemplary embodiments within the scope of the claims and the scope of equivalents.

Even though 7(A) and 7(B) For example, for example, where the conductive patterns 11 and 12 are provided on two layers of the base material 13, the conductive pattern 11 or 12 may be provided on a plurality of layers, such as three or more Layers of the base material 13, and the second capacitance component may be provided in a space between conductive patterns in the thickness direction of the base material 13.

In addition, the end of the conductive pattern 11 and the end of the conductive pattern 11 by abutting each other with a predetermined distance can provide the first capacitance component in the space. Similarly, the end of the conductive pattern 11 divided by the discontinuous portion and the end of the conductive pattern 11 by abutting each other at a predetermined distance can provide the second capacitance component in the space.

Reference List

C

capacitor (capacitance component)

C1

Capacitor (first capacitance component)

C2, C21, C22

Capacitor (second capacitance component)

L, L2

inductor (inductance component)

10

article

11, 12

conductive structure

11D

broken section

13

base material

14

adhesive layer

20

RFI D tagged item

21, 21A, 21B

RFID tag

30

antenna substrate

31

reader/writer antenna

101, 102, 103, 104, 105

RFID auxiliary antenna device

301

reader/writer

Claims (9)

An auxiliary RFID antenna device which is an auxiliary antenna device to be provided on an article which is adjacent to an RFID tag to be communicated or houses the RFID tag, the auxiliary RFID antenna device having a conductive structure which Article encloses where a capacitance component generated between conductive patterns and an inductance component of the conductive pattern form a resonant circuit; and a resonant frequency of the resonant circuit is equal or substantially equal to a communication frequency of the RFID tag. The RFID auxiliary antenna device according to FIG claim 1 wherein: the capacitance component comprises a first capacitance component and a second capacitance component; the first capacitance component is a capacitance component generated between vicinities of ends in a circular direction in which the conductive pattern is circular; the conductive pattern is elongated in the circular direction and includes a discontinuous portion in the circular direction; and the second capacitance component is a capacitance component generated between the conductive patterns of the discontinuous portion. The RFID auxiliary antenna device according to FIG claim 2 wherein the conductive pattern is provided on a base material having a sheet-like shape; and the first capacitance component is provided between the conductive patterns between which the base material is sandwiched. The RFID auxiliary antenna device according to FIG claim 3 wherein: the conductive structure is provided in a plurality of layers of the base material; and the second capacitance component is generated in a space between the conductive patterns, the space being provided in a thickness direction of the base material. The RFID auxiliary antenna device according to FIG claim 3 wherein the second capacitance component is generated in a space between the conductive patterns, the space being provided in a plane direction of the base material. The RFID auxiliary antenna device according to FIG claim 1 wherein: the conductive structure is provided on a surface of the article; and the capacitance component is created in a space between the conductive patterns aligned along the surface of the article. The RFID auxiliary antenna device according to FIG claim 2 wherein: the conductive structure is provided on a surface of the article; and the first capacitance component and the second capacitance component are provided in a space between the conductive patterns aligned along the surface of the article. The RFID auxiliary antenna device according to any one of Claims 1 until 7 , in which the capacitance component is a capacitance component generated between the conductive patterns. The RFID auxiliary antenna device according to any one of Claims 1 until 8th , in which the conductive structure is magnetically coupled to the RFID tag.

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